WO2012062792A1 - Method and system for detecting corrosion of an insulated corrosion prone object - Google Patents
Method and system for detecting corrosion of an insulated corrosion prone object Download PDFInfo
- Publication number
- WO2012062792A1 WO2012062792A1 PCT/EP2011/069718 EP2011069718W WO2012062792A1 WO 2012062792 A1 WO2012062792 A1 WO 2012062792A1 EP 2011069718 W EP2011069718 W EP 2011069718W WO 2012062792 A1 WO2012062792 A1 WO 2012062792A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fluid
- corrosion
- tracer
- insulation layer
- sweep
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
Definitions
- the invention relates to a method and system for detecting corrosion of an insulated corrosion prone ob ect .
- Inspection of insulated corrosion prone objects generally requires removal of at least part of the insulation layer to facilitate the inspection and
- electrically conductive electrolyte as a tracer for the presence of corrosion of the metal pipe.
- JP58167948 disclose electrochemical and electrode
- DTS Distributed Temperature Sensor
- a method for detecting corrosion of an insulated corrosion prone object which is at least partly covered by a permeable insulation layer with pores containing a pore fluid, the method comprising taking a sample of the pore fluid and analyzing the composition of the sample on the presence of any tracer fluid emitted by any corrosion of the corrosion prone object, wherein the sample is taken by injecting a sweep fluid into the pores of the
- the permeable insulation layer and capturing a mixture of the sweep fluid and the core fluid and any tracer fluid from the permeable insulation layer. If the insulation layer has a low permeability then the sample may be taken by stabbing a hollow needle into the insulation layer and excavating through the needle an amount of pore fluid for analysis.
- the tracer fluid may comprise phosphine gas, mercaptans, alcohols, acids, ketones, aldehydes , and/or any other chemical composition released during iron oxidation.
- the phosphine gas may comprise phosphine (PH 3 ) and/or organophosphine .
- the organophosphine may comprise CH 5 PO 2 , known as Methyl Phosphinic Acid or MPA.
- the mercaptans may comprise methylmercaptan (CH 4 S), the alcohols methanol (CH 4 O) , the acids acetic acid (C 2 H 4 O) , the ketons acetone (C 3 H 6 0) and the aldehydes acetaldehyde (C 2 H 5 O) .
- the permeable insulation layer may be arranged between an outer surface of the corrosion prone object and an inner surface of a substantially impermeable protective layer, in which case the sweep fluid may be injected through a tracer fluid injection conduit, which is stabbed through the protective layer into the
- the mixture of the sweep fluid, the core fluid and any tracer fluid may be captured through a fluid excavation conduit, which is stabbed through the protective layer into the permeable insulation layer.
- the fluid excavation conduit co-axially surrounds the sweep fluid injection conduit.
- the corrosion prone object is an insulated tubular, which is surrounded by tubular permeable
- the sweep fluid injection conduit may be stabbed near one end of the insulated tubular through the wall of the impermeable layer into pores of the permeable insulation layer and the fluid excavation conduit may be stabbed near another end of the insulated tubular through the wall of the impermeable layer into pores of the permeable layer.
- the insulated tubular may be a carbon steel oilfield tubular or a carbon steel tubular or vessel in a crude oil and/or gas natural gas processing or oil refinery plant and the method is used for non-intrusive inspection of the tubular on the presence of rust, and the tubular is approved for processing of hydrocarbon fluid if the fluid mixture comprising sweep fluid, pore fluid and any tracer fluid comprises up to a predetermined maximum content of phosphine gas, mercaptans, alcohols, acids, ketones, aldehydes , and/or any other chemical composition released during iron oxidation.
- the sweep fluid may comprise a reactive rust tracer component which reacts with rust and/or other corrosion products. If the corrosion prone object comprises iron then the reactive rust tracer component may comprise acetic acid and/or butoxyethanol , which reacts with and is therefore absorbed by rust.
- the sweep fluid may comprise a non-reactive
- an inert gas such as nitrogen and/or a mix of air/inert gas
- the reactive rust tracer component such as acetic acid, phosphoric acid and/or butoxyethanol, which reactive rust tracer
- the reactive rust tracer component may be added in a small amount to the sweep fluid.
- a system for detecting corrosion of a surface of a corrosion prone object which is at least partly covered by a permeable insulation layer that comprises a pore fluid
- the system comprising a fluid excavation conduit for capturing a sample of the pore fluid from the
- permeable insulation layer and means analyzing the composition of the sample on the presence of any tracer fluid emitted or absorbed by any corrosion of the
- FIG.l depicts an insulated corrosion prone tubular, which is inspected on corrosion utilizing the method according to the invention.
- FIG.2 is a graph showing results of an comparative experiment wherein acetic acid is injected into annuli surrounding clean and rusted steel cylinders, wherein in the latter case at least some of the injected acetic acid reacts with and is absorbed by the rust.
- FIG.l depicts a corrosion prone tubular object 1 of which the outer surface is covered by a porous and permeable insulation layer 2 of which the outer surface may be coated with a protective layer or cladding 3.
- the pores of the insulation layer 2 are filled with a pore fluid of which a sample is optionally taken by injecting, as illustrated by arrow 4, a sweep fluid, such as air and/or an inert gas, via a sweep fluid injection conduit 7, which is stabbed through the protective layer or cladding 3 into the insulation layer 2.
- Arrow 5 illustrates how a fluid excavation conduit 9 is stabbed through the protective layer 3 into the insulation layer at a selected distance from the fluid injection conduit 4.
- a mixture 8 of sweep fluid, pore fluid and any tracer fluid generated by corrosion of the corrosion prone tubular object 1 is excavated from the pores of the insulation layer via the fluid injection and excavation conduits 7 and 9 and fed into a sensor 6 which measures the concentration of tracer fluid, if any, in the mixture 8 of sweep gas, core fluid and any tracer fluid passing through the fluid injection and excavation conduits 7 and 9.
- the pore fluid mixture 8 of sweep gas, core fluid and any tracer fluid is recycled back via the fluid excavation conduit 7 into the insulation layer 2 as illustrated by the arrows 4, 5 and 8 in Figure 1.
- the method according to the invention may be carried out with a single hose 7 through which a batch of the sweep fluid is initially injected into the permeable insulation layer 2 and through which subsequently sweep fluid, pore fluid and any tracer fluid is sucked out of the insulation layer 2.
- the fluid injection and evacuation may be performed by stabbing an injection needle into the insulation layer 2, through which the sweep fluid is initially injected and through which subsequently the mixture of sweep, pore and tracer fluids is evacuated from the insulation layer 2.
- the non- intrusive Corrosion Under Insulation (CUI) detection method according to the invention is particularly useful to inspect an insulated corrosion prone steel object 1 on the presence of rust.
- Rusting steel has a particular odour believed to be due to the emission of an organophospine (MPA) or
- phospine gas that is a by-product of the rusting process due to the presence of carbon and phosphorous components in the steel. Furthermore, rusting steel produces a specific emission pattern of compounds like mercaptans, alcohols, acids, ketones, aldehydes.
- the method and system according to the present invention permit effective monitoring of long stretches of piping 1 and/or large areas of vessels for CUI without the need for installing expensive scaffolding and such that safety problems are avoided which relate to removing insulation from hot piping 1 or shutting down piping 1 section all together to allow for inspection.
- organophosphine gas methylphosphinic acid, or MPA, CH 5 PO 2
- Phosphine gas methylphosphinic acid, or MPA, CH 5 PO 2
- the MPA, Phosphine, mercaptans, alcohols, acids, ketones, aldehydes are by-products of the rusting process and are due to the presence of carbon and phosphorous components in the steel.
- insulation 2 indicates the onset of CUI, originating from iron oxides forming at a breach in the protective
- the method according to the invention may be used to detect CUI on newly coated items 1 by detecting
- the sensitivity of the corrosion detection system according to the invention may be enhanced by maintaining the circulation flow illustrated by arrows 4,5 and 8 for a longer period of time.
- the system according to the invention provides an easily, flexible and low-cost deployable non intrusive CUI detection system since the sensor 6, pump and hoses 7 can be applied virtually anywhere; connected through holes 4,5 in the cladding 3 (which may be equipped with water detectors when not inspecting) .
- a highly sensitive multi component sensor 6 for detecting trace gases, such as MPA/Phosphine, mercaptans, alcohols, acids, ketones and/or aldehydes in the sampled pore fluid mixture 8 is commercially available and works best at higher temperatures and atmospheric pressure (most susceptible CUI range: 50-110°C, 1 bar) .
- This sensor 6 is a Proton Transfer Reaction-Mass Spectrometer, abbreviated as PTR-MS, marketed by the company Ionimed in Innsbruck, Austria.
- the PTR-MS sensor 6 allows online measurements of trace components with concentrations as low as pptv in the sampled pore fluid mixture 8 up to a time response of 0.1 sec .
- H 3 0 + ions do not react with any compounds which have a proton affinity lower than 3 ⁇ 40, being 7,22 eV, but they do transfer their proton to
- VOC's all of which - with the exception of a very few - have proton affinities larger than 7,22 eV.
- the method according to the invention may be used to detect Corrosion Under Insulation (CUI ) on external surfaces of insulated pipes 1 and/or other equipment surface, and also at complex structures, like iron reinforcement rods of concrete structures, supports or other insulated metal or other corrosion prone objects.
- CCI Corrosion Under Insulation
- the uptake of a rust reactive sweep fluid by steel corrosion products, such as rust may be detected in accordance with the method according to the invention.
- the uptake may be detected by injecting a sweep fluid mixture that comprises, in substantially equal volumes, both the rust reactive sweep fluid (for example acetic acid: CH 3 COOH, and/or butoxyethanol ) and another
- inert or non-reactive, sweep fluid for example N 2 and/or MeOH
- inert or non-reactive, sweep fluid for example N 2 and/or MeOH
- a difference in concentration between the rust reactive sweep fluid (CH 3 COOH) and the inert sweep fluid will provide an indication of the size of the corroded area.
- the rust reactive sweep fluid may comprise acetic acid (CH 3 COOH) that adheres to the corrosion products (Fe 2 C) 3 and/or FeO(OH)) on the basis of the following chemical reactions:
- Figure 2 shows the results of a laboratory test wherein acetic acid (CH 3 COOH) is injected into an annular space 2 surrounding a clean steel cylinder 1 and an annular space surrounding a rusted steel cylinder 1 of a similar size as the clean, unrusted steel cylinder 1.
- acetic acid CH 3 COOH
- Line 60 shows the amount of acetic acid returned from the annulus surrounding the rusted steel cylinder 1 and line 61 shows the amount of acetic acid returned from the annulus surrounding the clean, unrusted, steel cylinder 1.
- Lines 60 and 61 show that the amount of acetic acid returned from the annulus surrounding the clean
- cylinder 1 is larger than the amount of acetic acid returned from the annulus surrounding the annulus surrounding the rusted cylinder 1. The difference is expected to result from the chemical reactions between rust and acetic acid shown above.
- the corrosion does not have to be active (no
- the concentration drop of the reactive substance such as acetic acid or butoxyethanol, seems to be (linearly) related to the corroded area, which allows for classification based on the extent of the corrosion under insulation (CUI ) .
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2011328148A AU2011328148B2 (en) | 2010-11-09 | 2011-11-09 | Method and system for detecting corrosion of an insulated corrosion prone object |
CA2815917A CA2815917C (en) | 2010-11-09 | 2011-11-09 | Method and system for detecting corrosion of an insulated corrosion prone object |
GB201307390A GB2499138B (en) | 2010-11-09 | 2011-11-09 | Method and system for detecting corrosion of an insulated corrosion prone object |
US13/884,232 US9267874B2 (en) | 2010-11-09 | 2011-11-09 | Method and system for detecting corrosion of an insulated corrosion prone object |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10190469 | 2010-11-09 | ||
EP10190469.6 | 2010-11-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012062792A1 true WO2012062792A1 (en) | 2012-05-18 |
Family
ID=43857708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2011/069718 WO2012062792A1 (en) | 2010-11-09 | 2011-11-09 | Method and system for detecting corrosion of an insulated corrosion prone object |
Country Status (5)
Country | Link |
---|---|
US (1) | US9267874B2 (en) |
AU (1) | AU2011328148B2 (en) |
CA (1) | CA2815917C (en) |
GB (1) | GB2499138B (en) |
WO (1) | WO2012062792A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014198299A1 (en) * | 2013-06-11 | 2014-12-18 | Statoil Petroleum As | Estimation of a condition of equipment |
Families Citing this family (7)
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CA2882491C (en) * | 2012-08-22 | 2021-03-09 | Franklin Fueling Systems, Inc. | Method and apparatus for limiting acidic corrosion in fuel delivery systems |
US10060570B2 (en) * | 2013-01-09 | 2018-08-28 | Cidra Corporate Services, Inc. | Smart pipe concept based on embedded taggant-sensor and/or color-encoded elements to monitor liner wear in lined pipelines, including urethane lined pipe |
US9217810B2 (en) * | 2014-05-21 | 2015-12-22 | Iball Instruments, Llc | Wellbore FTIR gas detection system |
US10481099B2 (en) * | 2015-07-02 | 2019-11-19 | Exxonmobil Upstream Research Company | Detecting moisture proximate to insulation |
US10222290B2 (en) * | 2015-08-11 | 2019-03-05 | Exxonmobil Upstream Research | Detecting moisture proximate to insulation |
GB201601609D0 (en) | 2016-01-28 | 2016-03-16 | Univ Cranfield | Corrosion detection system |
US11041378B2 (en) | 2019-07-08 | 2021-06-22 | Saudi Arabian Oil Company | Method and apparatus for detection of pitting corrosion under iron sulfide deposition |
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JPS58167948A (en) | 1982-03-29 | 1983-10-04 | Toshiba Corp | Corrosion speed measuring instrument |
JPS6379053A (en) | 1986-09-22 | 1988-04-09 | Nippon Steel Corp | Corrosion test for metal material |
US5526689A (en) * | 1995-03-24 | 1996-06-18 | The Babcock & Wilcox Company | Acoustic emission for detection of corrosion under insulation |
WO2000045148A1 (en) | 1999-01-26 | 2000-08-03 | Integriti Investments Ltd. | Corrosion sensors contained within the thermally insulating member of a metal pipe |
GB2368914A (en) | 2000-08-25 | 2002-05-15 | Univ Wales Swansea The | Determining corrosion of coated metals using leaching material |
KR20060015152A (en) | 2004-08-13 | 2006-02-16 | 코렐테크놀로지(주) | Apparatus and method for maintenance of equipment using oil, gas and petrochemical plants |
WO2008047068A1 (en) | 2006-10-19 | 2008-04-24 | Schlumberger Holdings Limited | System and method for detecting moisture |
WO2009126802A1 (en) | 2008-04-09 | 2009-10-15 | Battelle Memorial Institute | Corrosion detection product and method |
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US4013924A (en) * | 1970-03-19 | 1977-03-22 | A/S E. Rasmussen | Methods and means for detecting the presence of moisture adjacent insulated pipes |
US4189938A (en) * | 1978-12-13 | 1980-02-26 | Heath Consultants, Incorporated | Double tracer gas process for locating conduit leaks |
CA1076894A (en) * | 1979-01-11 | 1980-05-06 | Louis M. Michaud | Corrosive fluid detector |
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-
2011
- 2011-11-09 GB GB201307390A patent/GB2499138B/en not_active Expired - Fee Related
- 2011-11-09 AU AU2011328148A patent/AU2011328148B2/en not_active Ceased
- 2011-11-09 CA CA2815917A patent/CA2815917C/en not_active Expired - Fee Related
- 2011-11-09 US US13/884,232 patent/US9267874B2/en not_active Expired - Fee Related
- 2011-11-09 WO PCT/EP2011/069718 patent/WO2012062792A1/en active Application Filing
Patent Citations (8)
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JPS58167948A (en) | 1982-03-29 | 1983-10-04 | Toshiba Corp | Corrosion speed measuring instrument |
JPS6379053A (en) | 1986-09-22 | 1988-04-09 | Nippon Steel Corp | Corrosion test for metal material |
US5526689A (en) * | 1995-03-24 | 1996-06-18 | The Babcock & Wilcox Company | Acoustic emission for detection of corrosion under insulation |
WO2000045148A1 (en) | 1999-01-26 | 2000-08-03 | Integriti Investments Ltd. | Corrosion sensors contained within the thermally insulating member of a metal pipe |
GB2368914A (en) | 2000-08-25 | 2002-05-15 | Univ Wales Swansea The | Determining corrosion of coated metals using leaching material |
KR20060015152A (en) | 2004-08-13 | 2006-02-16 | 코렐테크놀로지(주) | Apparatus and method for maintenance of equipment using oil, gas and petrochemical plants |
WO2008047068A1 (en) | 2006-10-19 | 2008-04-24 | Schlumberger Holdings Limited | System and method for detecting moisture |
WO2009126802A1 (en) | 2008-04-09 | 2009-10-15 | Battelle Memorial Institute | Corrosion detection product and method |
Non-Patent Citations (1)
Title |
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D. GLINDEMANN, A. DIETRICH, H.J. STAERK, P. KUSCHK: "Angewandte Chemie", vol. 45, 2006, article "The two odors of iron when touched or pickled: (Skin) Carbonyl compounds and organophospines", pages: 7006 - 7009 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014198299A1 (en) * | 2013-06-11 | 2014-12-18 | Statoil Petroleum As | Estimation of a condition of equipment |
Also Published As
Publication number | Publication date |
---|---|
GB201307390D0 (en) | 2013-06-05 |
US20130224867A1 (en) | 2013-08-29 |
US9267874B2 (en) | 2016-02-23 |
AU2011328148A1 (en) | 2013-05-23 |
GB2499138B (en) | 2015-05-13 |
CA2815917C (en) | 2019-03-12 |
GB2499138A (en) | 2013-08-07 |
AU2011328148B2 (en) | 2014-06-19 |
CA2815917A1 (en) | 2012-05-18 |
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